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 A000853 Number of n-input 2-output switching networks under action of complementing group C(2,n) on inputs and S(2) and C(2,2) on outputs. (Formerly M3054 N1238) 1
 3, 18, 1200, 33601536, 72057597192044544, 664613997892457950142846397346480128, 113078212145816597093331040047546785266841516594958545044409945396273479680 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 REFERENCES M. A. Harrison, On the number of classes of switching networks, J. Franklin Instit., 276 (1963), 313-327. N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..10 FORMULA a(n) = (4^(2^n)+6*(2^n-1)*4^(2^(n-1))+2^(2^n+1))/2^(n+3). - Sean A. Irvine, Aug 11 2011 MAPLE A000853:=n->(4^(2^n)+6*(2^n-1)*4^(2^(n-1))+2^(2^n+1))/2^(n+3): seq(A000853(n), n=1..8); # Wesley Ivan Hurt, May 03 2017 PROG (MAGMA) [(4^(2^n)+6*(2^n-1)*4^(2^(n-1))+2^(2^n+1))/2^(n+3): n in [1..12]]; // Vincenzo Librandi, Aug 11 2011 CROSSREFS Sequence in context: A064846 A157544 A202946 * A065402 A131489 A069854 Adjacent sequences:  A000850 A000851 A000852 * A000854 A000855 A000856 KEYWORD nonn,easy AUTHOR EXTENSIONS More terms from Sean A. Irvine, Aug 10 2011 STATUS approved

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Last modified July 28 00:54 EDT 2021. Contains 346316 sequences. (Running on oeis4.)